Relation entre productivité et richesse spécifique du tapis herbacé au cours d'une succession écologique dans les Alpes du Sud françaises - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Acta Botanica Gallica Année : 2007

Relation entre productivité et richesse spécifique du tapis herbacé au cours d'une succession écologique dans les Alpes du Sud françaises

Résumé

The relationship between plant species richness and productivity on a watershed in southern French Alps was studied. Few studies have considered looking at previous land use when determining the relationship between species richness and biomass. The results indicate that productivity is a decreasing loglinear function of succession age. At a landscape level, the overall relationship between specific richness and productivity was found to be a log-linear function, as well as at a local scale, thus not in conformity with hump-back relationship usually presented. Moreover for the same level of productivity, the ancient forests would contain more species than the recent forests. In grasslands and shrubland, limiting resources and microtopography control the species richness. The peak of richness observed in grasslands for a productivity between 100 and 200 g.m(-2) indicated that grassland and shrub communities are probably unsaturated. Broadly it appears that the grazing has no overall effect on productivity nor on species richness per m(2) level. However sward dominance by Brachypodium pinnatum makes fall both the productivity and the specific richness. Therefore consequences for biodiversity conservation is questionable.
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Dates et versions

hal-01195018 , version 1 (07-09-2015)

Identifiants

  • HAL Id : hal-01195018 , version 1
  • PRODINRA : 40397
  • WOS : 000248474100008

Citer

Damien Marage, Jean-Jacques Brun. Relation entre productivité et richesse spécifique du tapis herbacé au cours d'une succession écologique dans les Alpes du Sud françaises. Acta Botanica Gallica, 2007, 154 (2), pp.275-292. ⟨hal-01195018⟩
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